dt-bindings: arm-smmu: Add compatible for QCM2290 SoC

Add the SoC specific compatible for QCM2290 implementing arm,mmu-500.

Signed-off-by: Loic Poulain <loic.poulain@linaro.org>
Link: https://lore.kernel.org/r/1633096832-7762-2-git-send-email-loic.poulain@linaro.org


[will: Sort by alphabetical order, rewrite commit message]
Signed-off-by: Will Deacon <will@kernel.org>